W520 - BIOS update (8buj19uc.iso) hangs after PXE booting

After PXE booting the latest 1.40 BIOS bootable CD,
the system hangs after pressing "2. Update system program"
Here my setup:
LABEL w520bios
MENU LABEL ^w. BIOS V1.40 W520  - 32bit - Normal    - ISO  - (EN)
TEXT HELP              
* Boot the W520 BIOS ISO image over PXE
ENDTEXT               
LINUX memdisk                                                    
INITRD ../isos/bios/w520/8buj19uc.iso
APPEND iso raw   
I need this feature, because we have several thinkpads to update!
Any help regard this topic is greatly appreciated

I had no clue what PXE is, so I looked it up:
The Preboot eXecution Environment (PXE, also known as Pre-Execution Environment; sometimes pronounced "pixie") is an environment to bootcomputers using a network interface independently of data storage devices (like hard disks) or installed operating systems.
http://en.wikipedia.org/wiki/Preboot_Execution_Environment
W520 4270CTO i7-2820QM Quadro2000M 1920x1080 Display 16GB RAM 2x240GB Intel 510 SSDs (RAID 0) - BIOS 1.42 - PCMark7:4,568
Samsung Series 9 15-inch NP900X4C-A03US - PCMark7: 4674

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